Payne's Dictionary of Pharmacy; For Students, Teachers and Examiners. the Official Drugs and Formulas Are Based on the United States Pharmacop Ia

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...ointment base in certain cases?--It is readily absorbed carrying the remedy with it, and will mix with much water. Why does the U_ S. I'. allow 30 per cent.H._, O in hydrous wool-fat?--Because the anhydrous is tough and sticky and the water gives it the proper consistency. Why is glycerite of starch used as an ointment base in certain cases?--Because it is not greasy and can be easily washed ofl'. Why should the drug be mixed with a smal por tion of the base first?--Because they can then be much more readily and thoroughly mixed. Why should a solid be in an impalpahle powder before mixing with the ointment base?--Because it is almost impossible to powder after mixing. Why should a steel spatula not-be used in making ointments containing tannic or salicylic acids'!---Because they react with the iron and thei dark saits discolor the ointment (use horn or wood). Why is oint. of tannic acid not heated?--I-leat causes the tannic acid to stick together in tough masses. The glycerine is also used to prevent this. Why is rose water used in cold cream instead of oil of rose?--Water makes the oint. more soft and creamy. Why is it well to stir oint. of rose water for some time?--'1'he more it is stirred the whiter it gets, by taking up air. Why is borax used in cold cream?--It makes it whiter and more creamy. Why is oleate of mercury used in making mercurial ointment?--Because it is a good agent tc extinguish the mercury (cause it to become finely divided). Why should mercurial ointment be kept in a cool place?--Because if warmed the mercury wili separate, What is blue ointment?--Diluted mercurial oint ment 33l/; per cent. metallic mercury. Why should a wooden or bone spatula be used it citrine ointment?--The acid attacks a stee...show more